Commit | Line | Data |
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b824efae TL |
1 | /* |
2 | * linux/arch/arm/mach-omap2/prcm.c | |
3 | * | |
4 | * OMAP 24xx Power Reset and Clock Management (PRCM) functions | |
5 | * | |
6 | * Copyright (C) 2005 Nokia Corporation | |
7 | * | |
8 | * Written by Tony Lindgren <tony.lindgren@nokia.com> | |
9 | * | |
c171a258 RN |
10 | * Copyright (C) 2007 Texas Instruments, Inc. |
11 | * Rajendra Nayak <rnayak@ti.com> | |
12 | * | |
b824efae | 13 | * Some pieces of code Copyright (C) 2005 Texas Instruments, Inc. |
37903009 | 14 | * Upgraded with OMAP4 support by Abhijit Pagare <abhijitpagare@ti.com> |
b824efae TL |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2 as | |
18 | * published by the Free Software Foundation. | |
19 | */ | |
c4d7e58f PW |
20 | |
21 | #include <linux/kernel.h> | |
b824efae TL |
22 | #include <linux/init.h> |
23 | #include <linux/clk.h> | |
a58caad1 | 24 | #include <linux/io.h> |
72350b29 | 25 | #include <linux/delay.h> |
dc28094b | 26 | #include <linux/export.h> |
b824efae | 27 | |
4e65331c | 28 | #include "common.h" |
ce491cf8 | 29 | #include <plat/prcm.h> |
44595982 | 30 | |
a58caad1 | 31 | #include "clock.h" |
feec1277 | 32 | #include "clock2xxx.h" |
59fb659b | 33 | #include "cm2xxx_3xxx.h" |
59fb659b | 34 | #include "prm2xxx_3xxx.h" |
d198b514 | 35 | #include "prm44xx.h" |
c4d7e58f | 36 | #include "prminst44xx.h" |
3f4990f4 | 37 | #include "cminst44xx.h" |
44595982 | 38 | #include "prm-regbits-24xx.h" |
ff4d3e18 | 39 | #include "prm-regbits-44xx.h" |
4814ced5 | 40 | #include "control.h" |
b824efae | 41 | |
59fb659b PW |
42 | void __iomem *prm_base; |
43 | void __iomem *cm_base; | |
44 | void __iomem *cm2_base; | |
610eb8c2 | 45 | void __iomem *prcm_mpu_base; |
a58caad1 | 46 | |
72350b29 PW |
47 | #define MAX_MODULE_ENABLE_WAIT 100000 |
48 | ||
b824efae TL |
49 | u32 omap_prcm_get_reset_sources(void) |
50 | { | |
ff00fcc9 | 51 | /* XXX This presumably needs modification for 34XX */ |
766d305f | 52 | if (cpu_is_omap24xx() || cpu_is_omap34xx()) |
c4d7e58f | 53 | return omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST) & 0x7f; |
37903009 | 54 | if (cpu_is_omap44xx()) |
c4d7e58f | 55 | return omap2_prm_read_mod_reg(WKUP_MOD, OMAP4_RM_RSTST) & 0x7f; |
0cc9314e KH |
56 | |
57 | return 0; | |
b824efae TL |
58 | } |
59 | EXPORT_SYMBOL(omap_prcm_get_reset_sources); | |
60 | ||
61 | /* Resets clock rates and reboots the system. Only called from system.h */ | |
baa95883 | 62 | void omap_prcm_restart(char mode, const char *cmd) |
b824efae | 63 | { |
0cc9314e | 64 | s16 prcm_offs = 0; |
44595982 | 65 | |
feec1277 PW |
66 | if (cpu_is_omap24xx()) { |
67 | omap2xxx_clk_prepare_for_reboot(); | |
68 | ||
ff00fcc9 | 69 | prcm_offs = WKUP_MOD; |
feec1277 | 70 | } else if (cpu_is_omap34xx()) { |
ff00fcc9 | 71 | prcm_offs = OMAP3430_GR_MOD; |
166353bd | 72 | omap3_ctrl_write_boot_mode((cmd ? (u8)*cmd : 0)); |
dac9a771 | 73 | } else if (cpu_is_omap44xx()) { |
e54433f1 | 74 | omap4_prminst_global_warm_sw_reset(); /* never returns */ |
dac9a771 | 75 | } else { |
ff00fcc9 | 76 | WARN_ON(1); |
dac9a771 | 77 | } |
ff00fcc9 | 78 | |
9bf83918 VB |
79 | /* |
80 | * As per Errata i520, in some cases, user will not be able to | |
81 | * access DDR memory after warm-reset. | |
82 | * This situation occurs while the warm-reset happens during a read | |
83 | * access to DDR memory. In that particular condition, DDR memory | |
84 | * does not respond to a corrupted read command due to the warm | |
85 | * reset occurrence but SDRC is waiting for read completion. | |
86 | * SDRC is not sensitive to the warm reset, but the interconnect is | |
87 | * reset on the fly, thus causing a misalignment between SDRC logic, | |
88 | * interconnect logic and DDR memory state. | |
89 | * WORKAROUND: | |
90 | * Steps to perform before a Warm reset is trigged: | |
91 | * 1. enable self-refresh on idle request | |
92 | * 2. put SDRC in idle | |
93 | * 3. wait until SDRC goes to idle | |
94 | * 4. generate SW reset (Global SW reset) | |
95 | * | |
96 | * Steps to be performed after warm reset occurs (in bootloader): | |
97 | * if HW warm reset is the source, apply below steps before any | |
98 | * accesses to SDRAM: | |
99 | * 1. Reset SMS and SDRC and wait till reset is complete | |
100 | * 2. Re-initialize SMS, SDRC and memory | |
101 | * | |
102 | * NOTE: Above work around is required only if arch reset is implemented | |
103 | * using Global SW reset(GLOBAL_SW_RST). DPLL3 reset does not need | |
104 | * the WA since it resets SDRC as well as part of cold reset. | |
105 | */ | |
106 | ||
dac9a771 | 107 | /* XXX should be moved to some OMAP2/3 specific code */ |
c4d7e58f PW |
108 | omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, prcm_offs, |
109 | OMAP2_RM_RSTCTRL); | |
110 | omap2_prm_read_mod_reg(prcm_offs, OMAP2_RM_RSTCTRL); /* OCP barrier */ | |
b824efae | 111 | } |
a58caad1 | 112 | |
72350b29 PW |
113 | /** |
114 | * omap2_cm_wait_idlest - wait for IDLEST bit to indicate module readiness | |
115 | * @reg: physical address of module IDLEST register | |
116 | * @mask: value to mask against to determine if the module is active | |
419cc97d | 117 | * @idlest: idle state indicator (0 or 1) for the clock |
72350b29 PW |
118 | * @name: name of the clock (for printk) |
119 | * | |
120 | * Returns 1 if the module indicated readiness in time, or 0 if it | |
121 | * failed to enable in roughly MAX_MODULE_ENABLE_WAIT microseconds. | |
59fb659b PW |
122 | * |
123 | * XXX This function is deprecated. It should be removed once the | |
124 | * hwmod conversion is complete. | |
72350b29 | 125 | */ |
419cc97d RL |
126 | int omap2_cm_wait_idlest(void __iomem *reg, u32 mask, u8 idlest, |
127 | const char *name) | |
72350b29 PW |
128 | { |
129 | int i = 0; | |
130 | int ena = 0; | |
131 | ||
419cc97d | 132 | if (idlest) |
72350b29 PW |
133 | ena = 0; |
134 | else | |
419cc97d | 135 | ena = mask; |
72350b29 PW |
136 | |
137 | /* Wait for lock */ | |
6f8b7ff5 PW |
138 | omap_test_timeout(((__raw_readl(reg) & mask) == ena), |
139 | MAX_MODULE_ENABLE_WAIT, i); | |
72350b29 PW |
140 | |
141 | if (i < MAX_MODULE_ENABLE_WAIT) | |
142 | pr_debug("cm: Module associated with clock %s ready after %d " | |
143 | "loops\n", name, i); | |
144 | else | |
145 | pr_err("cm: Module associated with clock %s didn't enable in " | |
146 | "%d tries\n", name, MAX_MODULE_ENABLE_WAIT); | |
147 | ||
148 | return (i < MAX_MODULE_ENABLE_WAIT) ? 1 : 0; | |
149 | }; | |
150 | ||
a58caad1 TL |
151 | void __init omap2_set_globals_prcm(struct omap_globals *omap2_globals) |
152 | { | |
4c3cf901 TL |
153 | if (omap2_globals->prm) |
154 | prm_base = omap2_globals->prm; | |
155 | if (omap2_globals->cm) | |
156 | cm_base = omap2_globals->cm; | |
157 | if (omap2_globals->cm2) | |
158 | cm2_base = omap2_globals->cm2; | |
610eb8c2 S |
159 | if (omap2_globals->prcm_mpu) |
160 | prcm_mpu_base = omap2_globals->prcm_mpu; | |
161 | ||
05e152c7 | 162 | if (cpu_is_omap44xx() || soc_is_omap54xx()) { |
610eb8c2 S |
163 | omap_prm_base_init(); |
164 | omap_cm_base_init(); | |
165 | } | |
a58caad1 | 166 | } |
3f4990f4 S |
167 | |
168 | /* | |
169 | * Stubbed functions so that common files continue to build when | |
170 | * custom builds are used | |
171 | * XXX These are temporary and should be removed at the earliest possible | |
172 | * opportunity | |
173 | */ | |
174 | int __weak omap4_cminst_wait_module_idle(u8 part, u16 inst, s16 cdoffs, | |
175 | u16 clkctrl_offs) | |
176 | { | |
177 | return 0; | |
178 | } | |
179 | ||
180 | void __weak omap4_cminst_module_enable(u8 mode, u8 part, u16 inst, | |
181 | s16 cdoffs, u16 clkctrl_offs) | |
182 | { | |
183 | } | |
184 | ||
185 | void __weak omap4_cminst_module_disable(u8 part, u16 inst, s16 cdoffs, | |
186 | u16 clkctrl_offs) | |
187 | { | |
188 | } |